76449991 has 2 divisors, whose sum is σ = 76449992. Its totient is φ = 76449990.

The previous prime is 76449983. The next prime is 76450007. The reversal of 76449991 is 19994467.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76449991 - 2³ = 76449983 is a prime.

It is a super-2 number, since 2×76449991² = 11689202247800162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76449091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38224995 + 38224996.

It is an arithmetic number, because the mean of its divisors is an integer number (38224996).

Almost surely, 2^76449991 is an apocalyptic number.

76449991 is a deficient number, since it is larger than the sum of its proper divisors (1).

76449991 is an equidigital number, since it uses as much as digits as its factorization.

76449991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 76449991 is about 8743.5685506548. The cubic root of 76449991 is about 424.4167149547.

The spelling of 76449991 in words is "seventy-six million, four hundred forty-nine thousand, nine hundred ninety-one".